QT学习小结之鼠标事件

qt鼠标事件所包含的头文件<QMouseEvent>，QMouseEvent中包含了两个坐标，一是全局坐标（globalPos()），即桌面坐标，这个跟Windows下的调用的getCursorPos函数得到的结果一致。

鼠标事件常见的有mousePressEvent()，mouseReleaseEvent()，mouseDoubleClickEvent()，mouseMoveEvent()，下面我就贴上几段代码吧

void Event_test::mouseMoveEvent(QMouseEvent *event)     //鼠标拖动事件

{

    QPoint point;

    point = QCursor::pos();

    qDebug()<<"point"<<point.x()<<"    "<<point.y();

    qDebug()<<"move :"<<"  "<<event->pos().x()<<"  "<<event->pos().y();

}

void Event_test::mousePressEvent(QMouseEvent *event)   //鼠标按下事件

{

    QString str="("+QString::number(event->x())+","+QString::number(event->y())+")";

    if(event->button()==Qt::LeftButton)

    {

        statusBar()->showMessage (tr("Mouse Left Button Pressed:")+str);//在状态栏中显示临时信息

    }

    else if(event->button()==Qt::RightButton)

    {

        statusBar()->showMessage (tr("Mouse Right Button Pressed:")+str);

    }

    else if(event->button()==Qt::MidButton)

    {

         statusBar()->showMessage (tr("Mouse Middle Button Pressed:")+str);

    }

    qDebug()<<"Press "<<"   "<<event->pos().x()<<"   "<<event->pos().y();

}

void Event_test::mouseReleaseEvent(QMouseEvent *event)      //鼠标释放事件

{
    QString str="("+QString::number(event->x())+","+QString::number(event->y())+")";
    
    statusBar()->showMessage (tr("Mouser Released:")+str,3000);

    qDebug()<<"release "<<"    "<<event->pos().x()<<"    "<<event->pos().y();

}

void Event_test::mouseDoubleClickEvent(QMouseEvent *event)    //鼠标双击事件

{

    QString str="("+QString::number(event->x())+","+QString::number(event->y())+")";

    if(event->button()==Qt::LeftButton)

    {

          statusBar()->showMessage (tr("Mouse Left Button Double Clicked:")+str);

    }

     else if(event->button()==Qt::RightButton)

    {

          statusBar()->showMessage (tr("Mouse Right Button Double Clicked:")+str);

    }

    else if(event->button()==Qt::MidButton)

    {

          statusBar()->showMessage (tr("Mouse Middle Button Double Clicked:")+str);

    }

}